(19)
(11) EP 0 633 391 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.08.1995 Bulletin 1995/32

(43) Date of publication A2:
11.01.1995 Bulletin 1995/02

(21) Application number: 94304509.6

(22) Date of filing: 21.06.1994
(51) International Patent Classification (IPC)6: E21B 34/14, E21B 47/09, E21B 34/06
(84) Designated Contracting States:
DE DK ES FR GB IT NL

(30) Priority: 21.06.1993 US 80610

(71) Applicant: HALLIBURTON COMPANY
Duncan Oklahoma 73536 (US)

(72) Inventors:
  • Venditto, James J.
    Sugar Land, Texas 77479 (US)
  • Stepp, Lee Wayne
    Comanche, Oklahoma 73529 (US)
  • Szarka, David D.
    Duncan, Oklahoma 73533 (US)

(74) Representative: Wain, Christopher Paul et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
       


    (54) Sliding sleeve casing tool


    (57) A sliding sleeve casing tool apparatus (10) for use in a casing string in a wellbore comprises a housing (58), a communication port (64) and a sliding sleeve (70) to open and close port (64). A radioactive source (146) is attached to the housing (58), and the orientation of the source may be determined by use of a detector apparatus, such as a rotational gamma ray detector. The casing valve thus may be aligned with the fracture of a zone of interest in the well. A plurality of casing valves may be used, with at least one having a radioactive source.












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